The Houghton Ensign Special Reflex Tropen (Tropical) is a single-lens reflex plate camera produced in a tropical specification, with teak or polished hardwood bodywork and brass fittings intended for use in humid climates. It belongs to the early twentieth-century era of British SLR plate cameras and was positioned as a premium variant of the Ensign Special Reflex line.

With only a single recorded UK auction result to reference, pricing guidance for the Tropen variant is limited: a hammer price of £900 was achieved in May 2012 at saleroom level. As of today in 2026 the camera remains scarce, and what one is worth at auction depends heavily on the condition of the wood, leather bellows and shutter blind, with clean working examples likely to sell for more than rougher ones — but with so little data, any single figure is indicative rather than a firm market value.